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Z established the sizes of the motors that are connected with the a111liAg nrachiu- ery. Laboratory experiments, pilot teats, and practical experience were also • factored into the choice of this flow sheet, which resulted in the final mill deer Ore from C.O.M. Int.'s mines ' transported to the millsite in a dum ck, and ~ re-- ore bins. 'These ore bins feed the crushing ~~ plant, which incorporates primary and secondary crushers in a closed-circuit. ~ ~° r - After crushing, the ore is stored in a fine ore bin with enough capacity tq insure ~ an 8 hour supply of ore for the grinding and concentrating cirouita of the mill. This fine ore is then conveyed to the grinding circuit to complete the comminu- tion process. Fresh water is added to the ore for wet grinding in a ball mill that is in closed-circuit with a spiral classifier. Gravity concentration follows the grinding circuit, with separation being accomplished by a double jig, a rag plant, and a shaking table. The gravity concentrates from each machine in this eec- • tion of the plant is pulled fi»m the milling circuit for collection and further treataent. The overflow from the shaking table carries the suspended, finely divided fraction of the pulverized ore to a large thickener tank. This thickener tank serves two important functions. It clarifies the mill water, which ie re- turned to the ball mill for recycline in the gravity circuit, and it increases the • concentration of the suspended solids prior to their flotation. The clarified water overflows a peripheral launder, while the solids settle on the bottom of the tank Four rotating radial arms with blades rake the settled solids towards an outlet at the center of the bottom of the tank. These rotating blades also assist in the compaction of'the settled particles, produce a thicker underfloor, and promote faster clarification of the mill water. A diaphragm pump is used • to lift the thickened pulp to a bank of flotation cells, where the concentration process is completed. Standard flotation reagents such as pine oil, soda ash, and santhate are used in the flotation cells. 'The tailings from the flotation circuit are pumped to the tailings pond, and the final concentrate pulp is col- lected for filtration. A disc vacuum filter dewatere the flotation concentrate, • which is shipped from the millsite for further treatment. C.O.M. Iuc.'s designed to have th bility prooe~0 tone of o a our peri ecauee the crushing p nt eectron of the re a e to true enoug ore in a single 8-hour shift to furnish the grinding circuit of the mill with a 24-hour supply of fine ore, it will only be operated one shift a day. In • order to achieve efficient grinding, maintain the ratio of concentration, and in- sure ahigh level of recovery, the grinding and concentrating circuits will be operated continuously. Initially, the milling facility will be operated 3 or 4 days a week for 24 hours a day. This schedule is based upon pralucing 50 tons of ore a day from C.O.M. Ines properties. • Tailings Impoundment Area On August 28, 1994, the site was visited by representatives from Mine Safety and Health Administration at C.O.M., Int.'s request. ?here were satisfied that the tailings impoundment was installed correctly, a Dopy of their opinion will be • f'orwanded to division under a separate cover. ~ ~. ~~~~~_ ~~ Ji a+~ ~. '~`;, ~ ~~ ~.